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Since the 1st January 2010, it is compulsory for all Spanish households to be in possession of an ICP (Interruptor Control de Potencia). ICP is a device which regulates the consumption of energy in your house, according to the rate of your current contract with iberdrola.
It is possible that if you are not in possession of an ICP, that the Iberdrola will demand that you install one as soon as possible. This often happens in houses that were built before 1985. I am more than happy to offer you advice so we can determine the best possible solution.